diff --git a/cypher/ast/tree.hpp b/cypher/ast/tree.hpp
index 0f7f93034..9b8b7ca2a 100644
--- a/cypher/ast/tree.hpp
+++ b/cypher/ast/tree.hpp
@@ -21,6 +21,18 @@ public:
         this->items = std::move(other.items);
     }
 
+    Ast& operator=(Ast&& other)
+    {
+        // TODO: write this more appropriate
+        // here is CP of above code
+        if(this != &other) {
+            this->root = other.root;
+            other.root = nullptr;
+            this->items = std::move(other.items);
+        }
+        return *this;
+    }
+
     AstVisitable* root;
 
     void traverse(AstVisitor& visitor)
diff --git a/cypher/codegen/cppgen.hpp b/cypher/codegen/cppgen.hpp
index cf02170d7..395e88c22 100644
--- a/cypher/codegen/cppgen.hpp
+++ b/cypher/codegen/cppgen.hpp
@@ -2,6 +2,7 @@
 
 #include <iostream>
 #include <typeinfo>
+#include <map>
 
 #include "cypher/visitor/traverser.hpp"
 
diff --git a/query_engine/compile.sh b/query_engine/compile.sh
new file mode 100755
index 000000000..2451f942a
--- /dev/null
+++ b/query_engine/compile.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+# TODO: create Makefile or cmake script
+clang++ -std=c++1y -I../ main.cpp ../cypher/cypher.cpp -o engine
diff --git a/query_engine/engine b/query_engine/engine
index 59d50c162..e2ccb1702 100755
Binary files a/query_engine/engine and b/query_engine/engine differ
diff --git a/query_engine/query_engine.hpp b/query_engine/query_engine.hpp
index 2c0ef9cc3..786e05187 100644
--- a/query_engine/query_engine.hpp
+++ b/query_engine/query_engine.hpp
@@ -21,11 +21,13 @@ class QueryEngine
 public:
     QueryResult execute(const std::string& query)
     {
-        cout << "execute: " << query << endl;
+        traverser.build_tree(query);
+        traverser.traverse();
         return QueryResult();
     }
 
 private:
+    // TODO: use IoC or something similar
     QueryTraverser traverser;
     CodeGenerator generator;
     CodeCompiler compiler;
diff --git a/query_engine/query_traverser.hpp b/query_engine/query_traverser.hpp
index c5405fd35..1297cfb86 100644
--- a/query_engine/query_traverser.hpp
+++ b/query_engine/query_traverser.hpp
@@ -1,5 +1,26 @@
 #pragma once
 
+#include "cypher/codegen/cppgen.hpp"
+#include "cypher/compiler.hpp"
+#include "cypher/ast/ast.hpp"
+
 class QueryTraverser
 {
+public:
+    QueryTraverser() = default;
+
+    void build_tree(const std::string& query)
+    {
+        tree = compiler.syntax_tree(query);
+    }
+
+    void traverse()
+    {
+        tree.root->accept(traverser);
+    }
+
+private:
+    ast::Ast tree;
+    cypher::Compiler compiler;
+    CppGen traverser;
 };